World at war should be good, but keep in mind Fallout 3 is awesome. Also, Mass Effect 2 is in production, and Destroy All Humans: Path of the Furon is coming out soon. There is also going to be a sequal to Army of 2. Another (I'm not sure that it fits the category, though) is Lord of the Rings: Conquests. All of these games look good, and I hope to get them soon.
recon you have to understand that the mic controls cant be perfect, so you could say one thing and it would take as another command. that would compromise the game and make people very mad